Hi Dave,
Well, if your not up to changing the leaking seal right now, then I'd say stay away from synthetic until the leak is fixed. I don't use synthetic in my B230F mostly because of it's mileage and therefore I'm afraid that it'll start leaking. I chose Shell Rotella T for it because it's supposed to be a high quality oil and I wanted something a little thicker then 10W30. I'd recommend you just try something like Castrol, Penzoil or Valvoline non-synthetic 10W30 for now and see how it likes that. You still might consider using an engine flush as it should help with the (sounds like) lifter problem, hopefully.
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Chris. Halifax N.S. '91 745Ti, 289K km and '91 745 NA, 375K km.
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